includes: identifier consistency in include guards

Made all header files to have LABWC_ prefix in include guard identifers.

Converted from __LABWC_ in 35 include/ files.
Converted from __LAB_ in 5 include/ files.
Added LABWC prefix to 3 include/ files.
Added include guards to 3 include/ files.

The double underscores were removed since according to C standard
those "are always reserved for any use".

include/xbm/parse.h

@@ -5,8 +5,8 @@
  * Copyright Johan Malm 2020
  */
 
-#ifndef __LABWC_PARSE_H
-#define __LABWC_PARSE_H
+#ifndef LABWC_PARSE_H
+#define LABWC_PARSE_H
 
 #include "xbm/tokenize.h"
 #include <stdint.h>
@@ -35,4 +35,4 @@ struct pixmap parse_xbm_tokens(struct token *tokens);
  */
 struct pixmap parse_xbm_builtin(const char *button, int size);
 
-#endif /* __LABWC_PARSE_H */
+#endif /* LABWC_PARSE_H */

include/xbm/tokenize.h

@@ -5,8 +5,8 @@
  * Copyright Johan Malm 2020
  */
 
-#ifndef __LABWC_TOKENIZE_H
-#define __LABWC_TOKENIZE_H
+#ifndef LABWC_TOKENIZE_H
+#define LABWC_TOKENIZE_H
 
 enum token_type {
 	TOKEN_NONE = 0,
@@ -31,4 +31,4 @@ struct token {
  */
 struct token *tokenize_xbm(char *buffer);
 
-#endif /* __LABWC_TOKENIZE_H */
+#endif /* LABWC_TOKENIZE_H */

include/xbm/xbm.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
-#ifndef __LABWC_XBM_H
-#define __LABWC_XBM_H
+#ifndef LABWC_XBM_H
+#define LABWC_XBM_H
 
 #include <wlr/render/wlr_renderer.h>
 
@@ -11,4 +11,4 @@
  */
 void xbm_load(struct theme *theme);
 
-#endif /* __LABWC_XBM_H */
+#endif /* LABWC_XBM_H */